Indicator for storage batteries



R. p. MowRY INDICATOR FOR STORAGE BATTERIES Filed May 23, 1925 06 6/7 Z Mow/y Patented Apr. 19,1921, I

UNITED STATES PATENT-OF ROBERT D. mownv,

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This invention relates to storage batteries in general and more particularly to indicating means therefor and has for its objectthe provision of an eflicientdevice' for indicata ing when the battery needs charging and when it is fully charged. F Y

It is further anobject of this invention to provide an indicator for batteries whereinthe indicating means designed to "sinkor 1e fioat according to the specific gravity of thefiuid in'the battery, is constrained-to'oper. atein a .certa-indefinte part of the battery where it maybe readily seen.

It is also an important object of this. invention to provide an indicator for batteries in which the indicating means is floated in a transparent-tube withm the battery.

Other and further important objects of this invention will be apparent from the dis-- closures in the specification and the accompanying drawings.

This invention g1? a preferred form) is I illustrated in the awings and hereinafter more fully described. I

.25 On the drawings: y

Figure '1 is an elevational view of abattery plate havin secured thereto an indicatln'g devise em dying. this invention,

Figure 2 is a fragmentary detailview of so the same.

Figure 3 is of the same.

Figure 4 is a horizontal fragmentary section at the line IV-IV of Figure2.

Figure 5 is a fragmentary. side elevation of Figure 2. As shown on the drawings: 1 1

Referring to Figure 1 there is shown a negative plate -1 of a storage battey which has secured thereto, in this instance inte gral therewith, an upper supporting annular member 2 having aii'integral. strap member 3. The plate'l has also integrally sef cured thereto a lower supporting annular 46 member 4 having a 'diametrical strap integral therewith and extending across the lower side thereof supported between the supporting members 2 and 4: is a cylindrical glass tube 6 which is open at either end.

a fragmentary top plan view Thelower ball '8 may varied depending upon the characteristics of tion of the device rugged, and such as may be-economically 'ciated 1925. Serial No. 32,245.

Floatable within the tube 6 depending upon the'specefic, gravity of thefluid within the battery jar are two balls 7 and 8. The upper ball 7 is preferably colored and in this instance, has a specific gravity of 1.210. be uncolored or of a color distinct fromthat of the upper ball the former, in this instance, having aspeof 1.250. The specific gravit of-the fluid ,in the batte will vary, suc

that at the maximum 0 arge. oint, the lower ball 8 will float'and at the maximum discharge point, the upper ball '7 will sink.

Both balls will of course be'.sunk (full line position. in Figure 2) when the maximum discharge point has been reached and both balls will .be floated. (dotted line position" in Figure 2) when the maximum charge point has been reached. The specific grav ities of the balls 7 and 8 may of 'coursebe and fluid therein. eobvious that by arranging the' balls 7 and 8 in-the manner describ have provided an, indicating device which will greatly facilitate the determination of the condition of the battery, v

It will also be obvious t at the construcshown herein is-sim'ple,

the batter It will manufactured.

I am aware that many changes may be made, and numerous details of construction maybe varied through a wide range without departing from the principles of this invention, and I thereforedo not p ose limiting the patent granted hereon, ot erwise than necessitated by the prior art.

'I claim as my invention:

The combination. with a storage-battery plate, of spaced supporting brackets assowith one edge thereof, a transparent open end tube supported by said brackets and specific gravity indicating means in said tube. y 1

In testimony whereof I have hereunto subscribed my name.

Rosana: n- MOWRY. 

